Summary of the invention
The quality determining method that the purpose of this invention is to provide a kind of Chinese medicine Radix Gentianae.The method utilizes the Electrospray Mass Spectrometry of Radix Gentianae crude extract as finger printing, utilizes high performance liquid chromatography to determine the content of Secoiridoid Glycosides chemical compound in the Radix Gentianae, has guaranteed the advance of accuracy and the quality inspection standard of quality determining method.
It is as follows to implement technical scheme of the present invention:
The Chinese medicine Radix Gentianae was pulverized the 60-80 mesh sieve, take by weighing the Radix Gentianae 50-200mg that has pulverized and put in the 50ml conical flask, the methanol take concentration of volume percent as 50%-100% adds methanol 5-20ml as solvent, supersound extraction 1-3 time, 20-40min/ time, 20-50 ℃ of supersound extraction temperature filtered, merge said extracted liquid and be concentrated into 1-2ml, methanol constant volume shakes up to 10ml, is test sample solution;
The electron spray finger printing of sample obtains as follows: get 50-100 μ L test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry; The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and spray voltage 3.5-5.5kV, capillary temperature 180-220 ℃, injection pump sample introduction flow velocity 2-8 μ l/min flows; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside, under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, m/z 735, and m/z 805, m/z 821 ions;
The high-efficient liquid phase chromatogram technology condition is as follows: C18 chromatographic column condition is 150mm * 4.6mm, 5 μ m, column temperature 20-35 ℃; Mobile phase is the first alcohol and water, methanol and water volume ratio 80: 20-30: 70, and elution time 30-60min; UV-detector detects wavelength: 190-400nm; Sample feeding amount 5-20 μ l;
The secoiridoid glycoside content assaying method is as follows: the standard reference material of precision weighing 1mg is gentiopicrin, sweroside and sweroside respectively, adds respectively dissolve with methanol and is settled in the 2ml volumetric flask, is made into standard reference material solution;
High-efficient liquid phase chromatogram determining condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 20 ℃ of column temperatures; Mobile phase: first alcohol and water, methanol and water volume ratio 80: 20, isocratic elution time 30min; UV-detector detects wavelength: 190nm.Each standard reference material is respectively with 2,4,6,8,10 μ l sample introductions, record the high performance liquid chromatography peak area of each standard reference material, take each standard reference material peak area of gained as vertical coordinate, each corresponding standard reference material content is abscissa drawing standard curve, calculates equation of linear regression;
Then according to the high performance liquid chromatography experiment condition of standard substance test sample solution is measured, the sample feeding amount is 5 μ l, obtain the peak area of the corresponding chromatographic peak of each standard reference material, record the content of gentiopicrin in the test sample, sweroside, sweroside according to standard curve.
Beneficial effect: the present invention utilizes the soft ionization mass-spectrometric technique that the crude extract of Radix Gentianae is detected, and according to number and the intensity of secoiridoid glycoside in the electron spray finger printing of the Radix Gentianae crude extract that obtains, the quality of Radix Gentianae is carried out preliminary assessment.This finger printing can clearly reflect the difference of the secoiridoid glycoside kind of bringing owing to the place of production, collecting season.The present invention considers that topmost drug activity composition is the Secoiridoid Glycosides chemical compound in the Radix Gentianae, and with gentiopicrin wherein, sweroside, three kinds of Secoiridoid Glycosides chemical compounds of sweroside are main, therefore the present invention with these three kinds of secoiridoid glycosides as standard reference material, pass through high-performance liquid chromatogram determination, obtain standard curve and the equation of linear regression of each standard reference material, then test sample solution is carried out high-performance liquid chromatogram determination, obtain the peak area of the corresponding chromatographic peak of each standard reference material, record gentiopicrin in the test sample according to standard curve, sweroside, the content of sweroside.
The sample pretreatment process of the method that the present invention provides is simple, and extraction efficiency is high.Utilize the Electrospray Mass Spectrometry of Chinese medicine Radix Gentianae extract as finger printing, can clearly find out the Radix Gentianae mass discrepancy that the different places of production, Various Seasonal are gathered by the secoiridoid glycoside kind, in conjunction with the assay result of high performance liquid chromatography to Lignanoids compounds in the Chinese medicine Radix Gentianae extract, can estimate the quality of Chinese medicine Radix Gentianae again.
The specific embodiment
Embodiment 1:
(1) test sample solution preparation
The Chinese medicine Radix Gentianae is pulverized, crossed 60 mesh sieves, take by weighing the Radix Gentianae 50mg that has pulverized and put in the 50ml conical flask, the adding concentration of volume percent is 50% methanol 5ml, supersound extraction 1 time, 20min/ time, 20 ℃ of supersound extraction temperature.Filter, merge said extracted liquid and be concentrated into 1ml, methanol constant volume shakes up to 10ml, is test sample solution.
(2) the electron spray finger printing of test sample
Get test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry.The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and spray voltage 3.5kV, 180 ℃ of capillary temperatures, injection pump sample introduction flow velocity 2 μ l/min flow; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside.Under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, and m/z 735, and m/z 805, m/z 821 ions.
(3) secoiridoid glycoside assay
The high performance liquid chromatography experiment condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 20 ℃ of column temperatures; Mobile phase: first alcohol and water, methanol and water volume ratio 80: 20, isocratic elution time 30min; UV-detector detects wavelength: 190nm; Sample feeding amount 5 μ l.
The secoiridoid glycoside content assaying method is as follows: standard reference material gentiopicrin, sweroside, the sweroside of difference precision weighing 1mg, place respectively the 2ml volumetric flask, and add dissolve with methanol and be settled to scale, be made into standard reference material solution.High-performance liquid chromatogram determination, each standard reference material record the high performance liquid chromatography peak area of each standard reference material respectively with 2,4,6,8,10 μ l sample introductions.Take each standard reference material peak area of gained as vertical coordinate, each corresponding standard reference material content is abscissa drawing standard curve, calculates equation of linear regression.Then according to the high performance liquid chromatography experiment condition of standard substance test sample solution is measured, the sample feeding amount is 5 μ l,, obtain the peak area of the corresponding chromatographic peak of each standard reference material, record the content of gentiopicrin in the test sample, sweroside, sweroside according to standard curve.
Embodiment 2:
(1) test sample solution preparation
The Chinese medicine Radix Gentianae is pulverized, crossed 80 mesh sieves, take by weighing the Radix Gentianae 200mg that has pulverized and put in the 50ml conical flask, adding concentration of volume percent is 100% methanol 20ml, supersound extraction 3 times, 40min/ time, supersound extraction temperature 50 C.Filter, merge said extracted liquid and be concentrated into 2ml, methanol constant volume shakes up to 10ml, is test sample solution.
(2) the electron spray finger printing of test sample
Get test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry.The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and spray voltage 5.5kV, 220 ℃ of capillary temperatures, injection pump sample introduction flow velocity 8 μ l/min flow; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside.Under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, and m/z 735, and m/z 805, m/z 821 ions.
(3) secoiridoid glycoside assay
The high performance liquid chromatography experiment condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 35 ℃ of column temperatures; Mobile phase: first alcohol and water, methanol and water volume ratio 30: 70, isocratic elution time 60min; UV-detector detects wavelength: 400nm; Sample feeding amount 20 μ l.
The secoiridoid glycoside content assaying method is with embodiment 1
Embodiment 3:
(1) test sample solution preparation
The Chinese medicine Radix Gentianae is pulverized, crossed 70 mesh sieves, take by weighing the Radix Gentianae 150mg that has pulverized and put in the 50ml conical flask, adding concentration of volume percent is 75% methanol 15ml, supersound extraction 2 times, 30min/ time, 35 ℃ of supersound extraction temperature.Filter, merge said extracted liquid and be concentrated into 1.5ml, methanol constant volume shakes up to 10ml, is test sample solution.
(2) the electron spray finger printing of test sample
Get test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry.The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and spray voltage 4.5kV, 200 ℃ of capillary temperatures, injection pump sample introduction flow velocity 6 μ l/min flow; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside.Under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, and m/z 735, and m/z 805, m/z 821 ions.
(3) secoiridoid glycoside assay
The high performance liquid chromatography experiment condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 30 ℃ of column temperatures; Mobile phase: the first alcohol and water, methanol and water volume ratio 80: 20-30: 70, gradient elution time 45min; UV-detector detects wavelength: 300nm; Sample feeding amount 15 μ l.
The secoiridoid glycoside content assaying method is with embodiment 1
Embodiment 4:
(1) test sample solution preparation
The Chinese medicine Radix Gentianae is pulverized, crossed 60 mesh sieves, take by weighing the Radix Gentianae 125mg that has pulverized and put in the 50ml conical flask, adding concentration of volume percent is 100% methanol 10ml, supersound extraction 2 times, 30min/ time, 25 ℃ of supersound extraction temperature.Filter, merge said extracted liquid and be concentrated into 1ml, methanol constant volume shakes up to 10ml, is test sample solution.
(2) the electron spray finger printing of test sample
Get test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry.The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and spray voltage 4.0kV, 190 ℃ of capillary temperatures, injection pump sample introduction flow velocity 5 μ l/min flow; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside.Under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, and m/z 735, and m/z 805, m/z 821 ions.
(3) secoiridoid glycoside assay
The high performance liquid chromatography experiment condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 30 ℃ of column temperatures; Mobile phase: the first alcohol and water, methanol and water volume ratio 55: 45-30: 70, gradient elution time 60min; UV-detector detects wavelength: 260nm; Sample feeding amount 10 μ l.
The secoiridoid glycoside content assaying method is with embodiment 1
Embodiment 5:
(1) test sample solution preparation
The Chinese medicine Radix Gentianae is pulverized, crossed 70 mesh sieves, take by weighing the Radix Gentianae 100mg that has pulverized and put in the 50ml conical flask, adding concentration of volume percent is 50% methanol 20ml, supersound extraction 3 times, 20min/ time, 40 ℃ of supersound extraction temperature.Filter, merge said extracted liquid and be concentrated into 2ml, methanol constant volume shakes up to 10ml, is test sample solution.
(2) the electron spray finger printing of test sample
Get test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry.The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and spray voltage 5.0kV, 210 ℃ of capillary temperatures, injection pump sample introduction flow velocity 4 μ l/min flow; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside.Under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, and m/z 735, and m/z 805, m/z 821 ions.
(3) secoiridoid glycoside assay
The high performance liquid chromatography experiment condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 25 ℃ of column temperatures; Mobile phase: the first alcohol and water, methanol and water volume ratio 80: 20-55: 45, gradient elution time 50min; UV-detector detects wavelength: 350nm; Sample feeding amount 10 μ l.
The secoiridoid glycoside content assaying method is with embodiment 1
Embodiment 6:
(1) test sample solution preparation
The Chinese medicine Radix Gentianae is pulverized, crossed 80 mesh sieves, take by weighing the Radix Gentianae 175mg that has pulverized and put in the 50ml conical flask, adding concentration of volume percent is 100% methanol 15ml, supersound extraction 3 times, 20min/ time, 40 ℃ of supersound extraction temperature.Filter, merge said extracted liquid and be concentrated into 1.5ml, methanol constant volume shakes up to 10ml, is test sample solution.
(2) the electron spray finger printing of test sample
Get test sample solution, after 10 times of methanol dilutions, make Electrospray Ionization Mass Spectrometry.The Electrospray Mass Spectrometry experiment condition is as follows: the electron spray ionisation source, and the electric 4.0kV that sprays, 160 ℃ of capillary temperatures, injection pump sample introduction flow velocity 7 μ l/min flow; Sweep limits mass-to-charge ratio (m/z) 50-2000 utilizes the cation Electrospray Mass Spectrometry to confirm the kind of secoiridoid glycoside.Under the cation condition, in m/z 100-1000 scope, have m/z 379, m/z 381, and m/z 395, and m/z 735, and m/z 805, m/z 821 ions.
(3) secoiridoid glycoside assay
The high performance liquid chromatography experiment condition is as follows: C18 chromatographic column (150mm * 4.6mm, 5 μ m); 30 ℃ of column temperatures; Mobile phase: first alcohol and water, methanol and water volume ratio 55: 45, isocratic elution time 45min; UV-detector detects wavelength: 280nm; Sample feeding amount 20 μ l.
The secoiridoid glycoside content assaying method is with embodiment 1.